Rotary cutter head



Dec. 21 1926. C. G. WILDERSON ROTARY CUTTER HEAD- I Filed May 29,1924 1 2 Sheets-Sheet 1 v gvyh Dec. 21 1926.

1,611,298 (3. G; WILDERSON i v ROTAR}! CUTTER HEADY 2 sheets-sheet 2 Filed May 29, 2

w k w m i ;Certain'preferredembodimentsofmyjin ventionjare illustrated n'theaccompanying H j V p v p I I bejforcedoutwardly thus causingthethroat 50 7 f; 2 of the cutter head has aplurality' of knife L V i i saidlugwillexert a lifting action on the s emed Dec. 21', 192 1,,

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i ROTARY confinemen I Application filed May 29, j

r The present invention relates to rotary cutter headssuch as are eniployedin jointers, planers, and similar-woodworking machines. '5; .In the patent to Harrold, No. 1,153,91(), Sept. 21, 1915, there is'disclosed a rotary A cutter head h'avin g' provisionfor accurately V adjusting the individual knives Without removing the knives fromtheir seats. In the 1 construction shown in'this patent, the knives are" firmly held in adjusted position by means of "throat piecesfgand" cooperating wedgeblocks and thrust screws arranged in tapered sockets communicating with the I knife receiving seats. VVh'enit' is desired to adjust a knife, the thrust screws cooperating therewith are loosenedto release the knife from the clamping pressure of" its throat piece, and the knifefis then adjusted 2Q outwardly by means ofa-toolinser ted successively in,openings intersecting the knife receiving seat, 'the tool' havinga lugarranged to engage the inner edge of the knife and move the'same outwardly-upon rotation of'the tool. A'difiiculty encountered in this ,inethod of adjustment is'to hold the ,knife inxits' adjusted position until the thrust screws are tightened, up. 7 By the present" invention I :have provided simple andeffective means .for overcoining this dif cutter head 1141 of Figure 1; r

v Figure 3 is a section taken son the line III III of Figure 1,-

" 'F'gures l and fi are'sections similar to Figure showing two tionsofthe invention;

' Figure 6 is a elevation of al r061 Qforf ald'i plll'sting the knive"s,,and

Figures-7 and 8 are, respectively, }a a plan.

"viewand sideelevation of one of the wedge; blocks.

In the construction. illustrated the body "(receiving seats" ,3extending longitudinally thereof and outwardly tapering sockets communicatingggwith the seats, a plurality 0f these'sockets' zbeing associated with-each removed. I

are preferably of a cylindricalform and are p fadapted to-receive a" cylindrical adjusting A wrench or implement- 15 having an*operat- I ing handle 16, atone-end jand'h'avi'ng a lug x16" projecting from the opposite endand wardlyf 'In adjusting'a knife bladeby 1924" f i' nt ma es, 5

seat. I Arranged' in each seat is bladeone side wallof its'seat 3 by the throat piece or holding bar 6, which' latter flatly and V solidly bears againstonesidei face of the; knife blade. The face of the throat piece opposite-that in engagement with the knife blade has a flange S sprOject-ing therefrom, the said fiange being-located at the inner edge'of the throat piece and being received 3 in a groove 9 communicating with the seat 8. The interlocking engagement between theflange '8 and groove serves to lockvthr-r V throat" piece against'zoutward displacement when the [parts are assembled fwhilefat the same time, permitting the throat 1 piece to] be readily'removed without sliding it 'endwise from its seat when the knife blade Arranged in each of the sockets' l I1 outwardly tapered wedge block. 10 having a to receivev althrustr screw 12," which is fadel v 'justablein said bore and bears against the bottornof the socket., The said thrust screw s v hasan .angular recess '13 to, receive an actu 1 T ating tool. a V ciated "with a knife blade are turned in one s s VVhen the thrust screws assodirection the coop-eratingwedge blocks will p ece e to clamp the 'knifeblade between w the i throat piece andfa jwallf of re:

ceiving seat.

"fThe body'fz of ithegcutter head "is' provided with' a suitibleFmimber of bearing holes'l l which i-erce the bod at'subs tantiall "ri 'ht' cation with thesame; These vbearing -holesp 1 adapted 'to; engage;the inner edge of a knife: blade, whereby, when the tool is rotated the c knife blade,' vcausing it" to be moved outmeans ofgthis tool, the tool' will' beinserted oo 7, and is" adapted to be held" fiat against] 80 threaded bore therethrough, as shown atv 11; i

' Harrold. In adjusting a transversely thereinto that which engages the i and the wall of the required amount as tightened up.

the cooperating hold the knife from in each of the holes 14 intersecting the knife seat and turned to move the blade outwardly determined by a gauge, for example, of the type shown in the patent to Harrold, above referred to. w

The construction so far described is identicalwith that disclosed in the patent to knife blade in this manner the thrust screws 12' associated with the blade must first be turned in a direction to permit the cooperating wedge blocks to be moved inwardly sufliciently to release the knife blade from the clamping action of the throat piece. f NVhen this is 'done difiiculty is experienced in holding the knife blade to its adjustedlposition untilthe wedge blocks can againbe moved into clamping engagement with the throat piece, When the adjusting tool is inserted in one ofthe holes and the blade moved outwardly at that point to bring the knife edge into engagement with the gauge, 7 lost while the blade is being further adjusted by the operation of the tool in another hole and when the blade has finally been ad- 'justed to the correct position,

it is apt to slip inwardly before the j wedge blocks can be By the present invention this difficulty is overcome by the provision of yielding means for holding the knife blade after it has been released from the clamping pressure due to the engagement of the wedge looks with the throatpiece.

,One form of my invention is shown in Figures 1, 2 and 3. Each throat piece has a number of holes 17 forexample 2, drilled from the face of the throat piece opposite knife blade. These holes extend only part way through the throat piece and arranged in each] of them is a coil spring 18 which b-ears,'at one end, against the bottom of the hole, and at its other end against a wall of the knife receiving seat. These'springs serve against the knife" to thrust the throat piece blade and yieldingly clamping the latter between the throat piece and a wall of the knife receiving seat when the I wedge blocks are loosened. This yielding clamping of the knife blade permitslthe latter to befadjusted, but at the same time exerts suiiicient friction between the faces of'the kn fe blades the knife receiving seat and justed position before the wedge blocks can be tightened up.

the knifeblade and at the other this adjustment is apt to be ing engagement face of the throat piece to slipping out of its ad-J In the modified form of the invention 7 shown in Figure 4 the holes 17 tirely through the throat piece sothat the springs 1S bear at one end directly against a wall of the knife receiving seat in the modified construct1on shown in Figure 5, the holes 17 extend into the throat piece from that-face thereof which engages the knife blade, so'that the springs 18 bear at one end directly against the knife blade and at the other end against the bottoms of V the holes. V I

The advantages of the invention will be readily apparent to those skilled in the art since it provides a simple, cheap and effective means-for adjusted position when the positive clamping pressure, due to the co-action of the wedge blocks with the throat pieces, is relieved, thereby facilitating the adjustment of the blades and shortening the time required for such adjustment.

lclaimz 1. A rotary cutter including a body member having a longitudinally extending slot therein, a cutter in the slot, a throat memher in the slot between one wall ofthe slot and the cutter, and means for yieldably urgextend en holding the-knifeblades in end against f ing the cutter into engagement with ,the t other wall. of the slot.

2; A rotary cutter including a body memher having an axially arranged slot therein,

cutter in the slot, a throat member in the. slot between one wall of the slot and the cut ter, and r-esilient mcans associated with the throat member'for urging the cutter against the other wall of the slot.

8. A rotary cutter of the class described including a bodyinember having an axially j cutter and one wall of the slot,"ad-justable wedges in the body -forcoop eration with V the throat member for holding it inclamo withfthe cutter, said body having transverse pockets therein extenoin into and terminating at thexbottoms of the slots, and resilient means associated with'the throat member for exerting pressure against the cutter when the wedge -members are moved to releasing position with respect to} the throat member.

5 In testimony "whereof, I have hereunto set my hand. y 7

t V CLINTON dwiLnnnson 

